Three of the five people in the vehicle were injured in the shooting and had to be rushed to the hospital, but are expected to survive, authorities said.

Multiple shell casings were found spread out on the highway, and based on this, investigators believe the shots were fired from another vehicle, although the information they have is limited.

"From the evidence collected at the scene it does look like it was vehicle to vehicle, because of where the shell casings were placed, where they landed," said California Highway Patrol officer Vu Williams, according to ABC News.

However, the victims were unable to provide a detailed account of how the event unfolded and Williams said it was "impossible to say" whether the shooting was a direct attack on the victims or whether it was randomized, CBS News noted.